:root{
  --bg:#f4f6fb;--card:#fff;--ink:#16203a;--muted:#6b7895;--line:#e4e9f3;
  --blue:#3b6cf6;--blue-d:#2b53c8;--blue-l:#eef3ff;
  --green:#0f8a5f;--green-l:#e9f9f1;--red:#cf3f4b;--red-l:#fdeff0;
  --amber:#9a6400;--amber-l:#fff6e2;
  --radius:18px;--shadow:0 8px 28px rgba(24,42,90,.07);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.5;-webkit-tap-highlight-color:transparent}
h1,h2,h3,h4{margin:0;line-height:1.35}
p{margin:0}
a{color:var(--blue)}
button{font-family:inherit}
.shell{max-width:1080px;margin:0 auto;padding:0 18px}
.muted{color:var(--muted)}
.small{font-size:12.5px}
.mono{font-variant-numeric:tabular-nums}
.hidden{display:none!important}

/* ---------- 顶栏 ---------- */
.topbar{background:linear-gradient(125deg,#12265c 0%,#2a53cc 58%,#4a7cf7 100%);color:#fff;padding:22px 0 26px;position:relative;overflow:hidden}
.topbar::before{content:"";position:absolute;width:420px;height:420px;right:-120px;top:-240px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.18),transparent 65%)}
.topbar::after{content:"";position:absolute;width:300px;height:300px;left:-140px;bottom:-220px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.1),transparent 65%)}
.brand{display:flex;align-items:center;gap:14px;position:relative;z-index:1;flex-wrap:wrap}
.logo{width:46px;height:46px;border-radius:14px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.28);display:grid;place-items:center;font-size:24px;font-weight:800;flex:0 0 auto}
.brand h1{font-size:22px;letter-spacing:.3px}
.tagline{font-size:13px;color:#cfdcff;margin-top:3px}
.top-right{margin-left:auto;display:flex;align-items:center;gap:10px;position:relative;z-index:1}
.mode-badge{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:650;padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.28);color:#fff}
.mode-badge .dot{width:7px;height:7px;border-radius:50%;background:#7ff0b8}
.mode-badge.local .dot{background:#ffd479}

/* ---------- 标签栏 ---------- */
.tabbar{position:sticky;top:0;z-index:30;background:rgba(244,246,251,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(228,233,243,.9)}
.tabbar .shell{display:flex;gap:6px;padding-top:10px;padding-bottom:10px;overflow-x:auto}
.tab{border:0;background:transparent;color:#4a5875;font-weight:650;font-size:14px;padding:9px 16px;border-radius:999px;cursor:pointer;white-space:nowrap}
.tab:hover{background:#e9eefb;color:#22345c}
.tab.active{background:#244fc6;color:#fff;box-shadow:0 6px 16px rgba(36,79,198,.28)}

/* ---------- 班级切换栏 ---------- */
.classbar{background:#eef2fb;border-bottom:1px solid #e4e9f3}
.classbar-inner{display:flex;align-items:center;gap:10px;padding:9px 0;overflow-x:auto}
.classbar-label{font-size:12px;font-weight:700;color:#6b7a99;letter-spacing:.06em;white-space:nowrap}
.class-chips{display:flex;gap:7px;flex:1;min-width:0;overflow-x:auto;padding-bottom:2px}
.class-chip{display:inline-flex;align-items:center;gap:6px;border:1px solid #dbe3f7;background:#fff;color:#33456b;font-weight:650;font-size:13px;padding:6px 12px;border-radius:999px;cursor:pointer;white-space:nowrap;transition:all .15s}
.class-chip:hover{border-color:#b9c9f7;background:#f7f9ff}
.class-chip.active{background:#1b3a8f;border-color:#1b3a8f;color:#fff;box-shadow:0 5px 14px rgba(27,58,143,.22)}
.class-chip .class-count{font-size:11px;font-weight:700;background:rgba(0,0,0,.06);border-radius:999px;padding:1px 7px}
.class-chip.active .class-count{background:rgba(255,255,255,.22)}
.class-chip.add{border-style:dashed;color:#4a5f8f;background:#f7f9ff}
.classbar-tools{display:flex;gap:6px;flex-shrink:0}
.cls-tag{margin-left:10px;font-size:inherit;font-weight:700;line-height:inherit;color:#244fc6;background:#eaf0ff;border-radius:999px;padding:1px 10px;vertical-align:middle;white-space:nowrap}
.meta-class{background:#eaf0ff;color:#244fc6;font-weight:700;border-radius:999px;padding:2px 9px}
.import-pick{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:12px}
.group-tag{margin-left:8px;font-size:10.5px}

main{padding:22px 0 70px}

/* ---------- 通用组件 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid transparent;border-radius:12px;padding:10px 16px;font-size:14.5px;font-weight:650;cursor:pointer;background:var(--blue);color:#fff;transition:background .15s,box-shadow .15s,transform .05s;min-height:42px;text-decoration:none}
.btn:hover{background:var(--blue-d)}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.ghost{background:#edf1fa;color:#2b3a5c}
.btn.ghost:hover{background:#e1e8f7}
.btn.outline{background:#fff;border-color:var(--line);color:#33415f}
.btn.outline:hover{background:#f7f9fe;border-color:#c8d4ec}
.btn.danger{background:#fff;border-color:#f2d2d6;color:var(--red)}
.btn.danger:hover{background:#fff5f6}
.btn.sm{padding:6px 11px;font-size:12.5px;border-radius:9px;min-height:32px}
.btn.block{width:100%}
.btn.lg{min-height:50px;font-size:16px;border-radius:14px}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.card + .card{margin-top:16px}
.card.flush{padding:0;overflow:hidden}
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:16px;flex-wrap:wrap}
.page-head h2{font-size:22px}
.page-head .sub{color:var(--muted);font-size:13.5px;margin-top:5px;max-width:640px}
.head-actions{display:flex;gap:8px;flex-wrap:wrap}
.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:22px 0 12px;flex-wrap:wrap}
.section-head h3{font-size:17px}
.back{border:0;background:none;color:#475b85;font-weight:650;cursor:pointer;padding:4px 2px;font-size:14px;display:inline-flex;align-items:center;gap:5px}
.back:hover{color:var(--blue)}

.lbl{display:block;font-size:13px;font-weight:700;color:#44546f;margin:16px 0 7px}
.lbl:first-child{margin-top:0}
.input,select.input,textarea.input{width:100%;border:1.5px solid #d9e1ef;border-radius:12px;padding:11px 13px;background:#fff;color:var(--ink);font:inherit;font-size:14.5px;transition:border-color .15s,box-shadow .15s}
textarea.input{min-height:84px;resize:vertical;line-height:1.6}
.input:focus,select.input:focus,textarea.input:focus{outline:none;border-color:#7b9bf8;box-shadow:0 0 0 3px rgba(59,108,246,.13)}
.hint{font-size:12.5px;color:var(--muted);margin-top:6px;line-height:1.6}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.badge{display:inline-flex;align-items:center;gap:4px;border-radius:999px;padding:3px 9px;font-size:11.5px;font-weight:700;background:var(--blue-l);color:#3358b8;white-space:nowrap}
.badge.gray{background:#f0f3f9;color:#5d6b86}
.badge.ok{background:var(--green-l);color:var(--green)}
.badge.bad{background:var(--red-l);color:var(--red)}
.badge.warn{background:var(--amber-l);color:var(--amber)}
.badge.type{background:#f3effe;color:#6d45c9}

/* ---------- 练习列表 ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.pcard{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px;position:relative;overflow:hidden}
.pcard::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(180deg,#3b6cf6,#7ba2ff)}
.pcard h3{font-size:17px;padding-left:6px}
.pcard .pdesc{color:var(--muted);font-size:13px;line-height:1.6;padding-left:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:21px}
.pmeta{display:flex;gap:8px;flex-wrap:wrap;padding-left:6px}
.pcard .actions{display:flex;gap:6px;flex-wrap:nowrap;padding-left:6px;margin-top:auto;padding-top:4px}
.pcard .actions .btn{flex:1 1 0;min-width:0;padding:6px 4px;font-size:12px;white-space:nowrap}

/* ---------- 空状态 ---------- */
.empty{padding:56px 20px;text-align:center;color:var(--muted)}
.empty .icon{width:64px;height:64px;border-radius:20px;background:var(--blue-l);display:grid;place-items:center;margin:0 auto 16px;font-size:30px;color:#4a72e8}
.empty h3{font-size:18px;color:var(--ink);margin-bottom:7px}
.empty p{font-size:14px;margin-bottom:18px}

/* ---------- 编辑练习 ---------- */
.edit-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.qlist{display:flex;flex-direction:column;gap:10px}
.qitem{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px}
.qitem .order{width:32px;height:32px;border-radius:10px;background:var(--blue-l);color:#3158bd;display:grid;place-items:center;font-weight:800;font-size:14px;flex:0 0 auto}
.qitem-main{flex:1;min-width:0}
.qitem .badges{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:6px}
.stem-sm{font-size:14.5px;font-weight:600;line-height:1.65;white-space:pre-wrap;overflow-wrap:anywhere}
.qitem .ansline{font-size:12.5px;color:var(--muted);margin-top:5px;overflow-wrap:anywhere}
.qitem-actions{display:flex;gap:5px;flex-wrap:wrap;justify-content:flex-end;flex:0 0 auto;max-width:230px}
.savebar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:20px;padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);position:sticky;bottom:14px}
.savebar .muted{font-size:12.5px}

/* ---------- 弹窗 ---------- */
.overlay{position:fixed;inset:0;background:rgba(17,28,55,.46);backdrop-filter:blur(3px);z-index:100;display:flex;align-items:flex-start;justify-content:center;padding:24px 14px;overflow-y:auto}
.modal-card{background:#fff;border-radius:20px;width:100%;max-width:660px;box-shadow:0 24px 70px rgba(15,30,70,.28);padding:24px;margin:auto;animation:pop .18s ease-out}
@keyframes pop{from{transform:translateY(10px) scale(.99);opacity:0}to{transform:none;opacity:1}}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:6px}
.modal-head h3{font-size:19px}
.icon-btn{border:0;background:#f1f4fb;width:34px;height:34px;border-radius:10px;cursor:pointer;color:#52617d;font-size:17px;display:grid;place-items:center}
.icon-btn:hover{background:#e6ebf7}
.modal-actions{display:flex;gap:9px;justify-content:flex-end;margin-top:22px;flex-wrap:wrap}
/* ---------- 删除密码弹窗 ---------- */
.del-warn{display:flex;flex-direction:column;gap:3px;background:#fff5f6;border:1px solid #f7d9de;border-radius:12px;padding:11px 14px;margin:12px 0 4px}
.del-warn b{font-size:14.5px;color:#b3261e;font-weight:700;word-break:break-word}
.del-warn span{font-size:12.5px;color:#8a5a62;line-height:1.6}
.del-err{min-height:18px;margin-top:7px;font-size:12.5px;font-weight:600;color:var(--red)}
#delPwd{letter-spacing:.18em;font-size:17px}
#delPwd.shake{animation:shakeX .34s ease}
@keyframes shakeX{0%,100%{transform:translateX(0)}20%{transform:translateX(-5px)}45%{transform:translateX(5px)}70%{transform:translateX(-3px)}88%{transform:translateX(3px)}}
.fieldset{border:1px solid var(--line);border-radius:14px;padding:14px 16px 18px;margin-top:18px}
.fieldset legend{font-size:13px;font-weight:700;color:#44546f;padding:0 6px}
.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:4px}
.checks{display:flex;gap:8px;flex-wrap:wrap;margin-top:4px}
.check{display:inline-flex;align-items:center;gap:7px;border:1.5px solid var(--line);border-radius:10px;padding:9px 14px;font-weight:650;cursor:pointer;background:#fff}
.check input{accent-color:var(--blue);width:17px;height:17px}
.check.on{border-color:#7b9bf8;background:var(--blue-l)}
.switch{display:flex;align-items:center;gap:9px;font-size:13.5px;font-weight:650;color:#44546f;cursor:pointer;user-select:none;margin-top:18px}
.switch input{width:18px;height:18px;accent-color:var(--blue)}

/* ---------- 二维码 ---------- */
.qr-card{max-width:430px;text-align:center}
.qr-box{width:240px;height:240px;margin:18px auto;border:1px solid var(--line);border-radius:16px;padding:8px;background:#fff}
.qr-box svg,.qr-box img{width:100%;height:100%;display:block}
.qr-title{font-size:16px;font-weight:700;margin-top:2px}
.url-box{display:flex;gap:7px;margin-top:14px}
.url-box input{flex:1;min-width:0;font-size:12.5px;color:#45536e;background:#f7f9fd}
.qr-help{font-size:12.5px;color:var(--muted);margin-top:14px;line-height:1.7;text-align:left;background:#f7f9fd;border-radius:12px;padding:11px 13px}
.qr-help b{color:#33415f}

/* ---------- 统计 ---------- */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.stat{background:#f7f9fe;border:1px solid #e9eefb;border-radius:14px;padding:15px 16px}
.stat b{display:block;font-size:26px;line-height:1.2;font-variant-numeric:tabular-nums}
.stat span{font-size:12.5px;color:var(--muted)}
.stat.accent{background:var(--blue-l);border-color:#dbe5ff}
.stat.accent b{color:#2b53c8}
.stats-tool{display:flex;gap:9px;align-items:center;flex-wrap:wrap}
.stats-tool select{max-width:280px;width:280px;flex:0 1 280px}
.auto-refresh{display:inline-flex;align-items:center;gap:7px}
.auto-refresh::before{content:"";width:8px;height:8px;border-radius:50%;background:#c3cbdc;box-shadow:0 0 0 3px rgba(195,203,220,.25)}
.auto-refresh.on{color:#137a4b;border-color:#cfe9dc;background:#f2fbf6}
.auto-refresh.on::before{background:#22a866;box-shadow:0 0 0 3px rgba(34,168,102,.16);animation:ar-pulse 2s ease-in-out infinite}
@keyframes ar-pulse{0%,100%{opacity:1}50%{opacity:.45}}
.ar-time{font-variant-numeric:tabular-nums}
.stats-toolbar{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px;margin-bottom:16px;box-shadow:var(--shadow)}
.stats-toolbar select{max-width:360px;width:auto;flex:1 1 260px}

/* ---------- 统计看板（四宫格） ---------- */
.dash-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:stretch}
.dash-card{background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);display:flex;flex-direction:column;min-width:0;overflow:hidden}
.flash-target{animation:dash-flash 1.8s ease-out 1;border-color:#b9cdf3}
@keyframes dash-flash{0%{box-shadow:0 0 0 0 rgba(47,107,255,.45)}60%{box-shadow:0 0 0 12px rgba(47,107,255,0)}100%{box-shadow:0 0 0 0 rgba(47,107,255,0)}}
.dash-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 18px 0;flex-wrap:wrap}
.dash-head-plain h3{font-size:15.5px;display:flex;align-items:center;gap:8px}
.dash-head-plain h3::before{content:"";width:3px;height:15px;border-radius:2px;background:#3b6cf6}
.dash-tabs{display:flex;gap:4px;flex-wrap:wrap}
.dash-tab{border:0;background:transparent;color:#5a6884;font-weight:700;font-size:13.5px;padding:7px 11px;border-radius:9px;cursor:pointer;white-space:nowrap;transition:background .15s,color .15s}
.dash-tab:hover{background:#f2f5fd;color:#2b3a5c}
.dash-tab.active{color:#244fc6;background:#eef3ff}
.dash-meta{font-size:12.5px;color:var(--muted);font-weight:650;white-space:nowrap}
.dash-body{padding:14px 18px 16px;flex:1;min-width:0;display:flex;flex-direction:column;gap:12px}
.donut-wrap{position:relative;width:164px;height:164px;margin:4px auto 0}
.donut{width:100%;height:100%;display:block}
.donut-text{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:1px}
.donut-text span{font-size:12px;color:var(--muted);font-weight:650}
.donut-text b{font-size:26px;line-height:1.15;font-variant-numeric:tabular-nums;color:#1d2c4d}
.donut-text i{font-style:normal;font-size:11px;color:#8593ad}
.dash-kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;border-top:1px dashed #e6ecf7;padding-top:12px;margin-top:auto}
.dash-kpis>div{text-align:center;min-width:0}
.dash-kpis b{display:block;font-size:19px;font-variant-numeric:tabular-nums;color:#1d2c4d;line-height:1.3}
.dash-kpis span{font-size:11.5px;color:var(--muted)}
.dash-foot{font-size:11.5px;color:var(--muted);line-height:1.65}
.dash-qchips{display:flex;gap:8px;flex-wrap:wrap}
.dash-qchip{position:relative;width:38px;height:38px;border-radius:10px;border:1px solid #dfe8f7;background:#f1f5fd;color:#3a5a8f;font-weight:800;font-size:14px;cursor:pointer;font-variant-numeric:tabular-nums;transition:all .15s}
.dash-qchip:hover{border-color:#b9cdf3;background:#e8effc}
.dash-qchip.active,.dash-qchip.active:hover{background:#fff;border-color:#2f6bff;color:#2f6bff;box-shadow:0 0 0 2px rgba(47,107,255,.30),0 6px 14px rgba(47,107,255,.20);transform:translateY(-2px)}
.dash-qchip-dot{position:absolute;top:4px;right:4px;width:7px;height:7px;border-radius:50%;background:transparent;box-shadow:0 0 0 1.5px #fff}
.dash-qchip.tier-good .dash-qchip-dot{background:#1f9d63}
.dash-qchip.tier-ok .dash-qchip-dot{background:#2f6bff}
.dash-qchip.tier-mid .dash-qchip-dot{background:#e08a2f}
.dash-qchip.tier-bad .dash-qchip-dot{background:#e4443f}
.dash-qdetail{display:flex;flex-direction:column;gap:9px;min-width:0}
.dash-qtitle{display:flex;align-items:center;gap:8px;font-size:13.5px;font-weight:700;color:#33415f;flex-wrap:wrap}
.dash-qtitle b{font-size:15.5px}
.dash-stem{font-size:12.5px;color:#5d6b86;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:-2px}
.dash-qstats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.dash-qstats>div{background:#f7f9fe;border:1px solid #eef2fb;border-radius:11px;padding:8px 10px;min-width:0}
.dash-qstats span{display:block;font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dash-qstats b{font-size:17px;font-variant-numeric:tabular-nums;color:#1d2c4d}
.dash-qstats .c-ok{color:var(--green)}
.dash-qstats .c-bad{color:var(--red)}
.dash-qstats b.tier-good{color:#1f9d63}
.dash-qstats b.tier-ok{color:#2f6bff}
.dash-qstats b.tier-mid{color:#e08a2f}
.dash-qstats b.tier-bad{color:#e4443f}
.dash-tier-legend{display:flex;flex-wrap:wrap;gap:6px 14px;margin:10px 0 2px;font-size:11.5px;color:var(--muted)}
.dash-tier-legend .tl{display:inline-flex;align-items:center;gap:5px}
.dash-tier-legend i{width:9px;height:9px;border-radius:50%;display:inline-block}
.dash-tier-legend i.tier-good{background:#1f9d63}
.dash-tier-legend i.tier-ok{background:#2f6bff}
.dash-tier-legend i.tier-mid{background:#e08a2f}
.dash-tier-legend i.tier-bad{background:#e4443f}
.dash-sub-line{font-size:12px;color:var(--muted);line-height:1.6}
.dash-sub-line b{color:#2b3a5c}
.dash-list{display:flex;gap:8px;align-items:flex-start;min-width:0}
.dash-list-label{flex:0 0 auto;font-size:11.5px;color:var(--muted);font-weight:700;padding-top:3px}
.dash-names{display:flex;flex-wrap:wrap;gap:5px;min-width:0;max-height:68px;overflow:auto}
.dash-name{background:#fdf1f1;border:1px solid #f6dcdc;color:#9b3a3a;border-radius:7px;padding:2px 8px;font-size:11.5px;white-space:nowrap}
.dash-name.wait{background:#fff6e2;border-color:#f6e3b8;color:var(--amber)}
.dash-name.more{background:#f2f4f9;border-color:#e3e8f2;color:#6b7895}
.dash-empty{font-size:12.5px;color:var(--muted)}
.dash-empty.inline{padding-top:3px}
.dash-table-wrap{max-height:344px;overflow:auto;border:1px solid var(--line);border-radius:11px;-webkit-overflow-scrolling:touch}
.dash-table{width:100%;border-collapse:collapse;font-size:12.5px}
.dash-table th{position:sticky;top:0;z-index:2;background:#f7f9fe;color:var(--muted);font-size:11.5px;font-weight:700;text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);white-space:nowrap}
.dash-table td{padding:8px 10px;border-bottom:1px solid #eef2f9;vertical-align:middle}
.dash-table tbody tr:last-child td{border-bottom:0}
.dash-table tbody tr:hover{background:#fbfcff}
.dash-table .col-name{white-space:nowrap}
.dash-table .col-name b{font-weight:700;color:#2b3a5c}
.rank-badge{display:inline-grid;place-items:center;min-width:20px;height:20px;border-radius:6px;background:#eef3ff;color:#3358b8;font-size:11px;font-weight:800;margin-right:6px;vertical-align:middle;font-variant-numeric:tabular-nums}
.rank-badge.gray{background:#f2f4f9;color:#9aa5ba}
.dash-table .col-class,.dash-table .col-sid{color:#5d6b86;white-space:nowrap}
.dash-table .col-score{white-space:nowrap;font-variant-numeric:tabular-nums}
.dash-table .col-score b{font-size:14.5px;color:#1d2c4d}
.dash-table .col-score i{font-style:normal;color:#96a2b8;font-size:11px}
.dash-table .col-solve{text-align:center;font-variant-numeric:tabular-nums;font-weight:700;color:#3a5a8f}
.dash-table tr.is-missing .col-name b{color:#7a879f;font-weight:600}
.dash-table .col-type{white-space:nowrap}
.dash-table .col-mastery{min-width:150px}
.mastery{display:flex;align-items:center;gap:8px}
.mastery-track{flex:1;min-width:56px;height:7px;border-radius:99px;background:#eef2fa;overflow:hidden}
.mastery-track i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#7ba2ff,#3b6cf6)}
.mastery span{font-weight:750;font-size:12px;color:#2b3a5c;white-space:nowrap}
.mastery-sub{display:block;font-size:10.5px;color:var(--muted);margin-top:3px;white-space:nowrap}
.relate-no{display:inline-grid;place-items:center;min-width:20px;height:20px;border-radius:6px;background:#f1f5fd;color:#3a5a8f;font-size:11px;font-weight:750;margin:1px 4px 1px 0}
.dash-table .col-relate{width:84px}
.dash-table .col-wrong{min-width:132px;width:150px}
/* 题型掌握表定宽，避免“掌握情况”把关联试题/错题学生挤成一列一个 */
.kp-table{table-layout:fixed}
.kp-table th:nth-child(1){width:68px}
.kp-table th:nth-child(3){width:72px}
.kp-table th:nth-child(4){width:136px}
.kp-table th:nth-child(5){width:60px}
.kp-table .col-relate{width:72px}
.kp-table .col-wrong{width:136px;min-width:0}
.kp-table .col-wrong .dash-name{font-size:10.5px;padding:2px 5px;margin:1px 3px 1px 0}
.dash-table .col-wrong .dash-name{display:inline-block;margin:1px 3px 1px 0}
.dash-table .col-op{text-align:right;white-space:nowrap}
.stats-note{margin:10px 2px 6px}
.score-badge{font-variant-numeric:tabular-nums}
.qstat{border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin-top:12px;background:#fff}
.qstat-head{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:8px}
.qstat-head .rate{margin-left:auto;font-weight:750;font-variant-numeric:tabular-nums;font-size:13.5px}
.bars{margin-top:12px;display:flex;flex-direction:column;gap:7px}
.bar-row{display:grid;grid-template-columns:52px 1fr 86px;gap:10px;align-items:center;font-size:12.5px}
.bar-track{height:9px;border-radius:99px;background:#eef2fa;overflow:hidden}
.bar-fill{height:100%;border-radius:99px;background:#9fb6ea;min-width:2px;transition:width .3s}
.bar-row.correct .bar-fill{background:#4fc194}
.bar-row.correct .bar-key{color:var(--green);font-weight:800}
.bar-key{font-weight:700;color:#5a687f}
.bar-val{text-align:right;color:var(--muted);font-variant-numeric:tabular-nums}
/* 图片型选项：加宽首列，字母在上、选项缩略图在下，方便老师看清每个选项对应哪张图 */
.bars-imgs .bar-row{grid-template-columns:100px 1fr 86px;align-items:center}
.bars-imgs .bar-key{display:flex;flex-direction:column;align-items:flex-start;gap:3px;line-height:1.25}
.bar-opt{display:block}
.bar-opt .q-img{display:block;max-height:66px;max-width:96px;margin-top:2px;border-radius:6px;background:#fff}
.wrong-list{display:flex;gap:6px;flex-wrap:wrap;margin-top:11px}
.wrong-chip{background:#fdf1f1;border:1px solid #f6dcdc;color:#9b3a3a;border-radius:9px;padding:5px 9px;font-size:12.5px}
.essay-list{margin-top:12px;display:flex;flex-direction:column;gap:9px}
.essay-item{border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fbfcff}
.essay-item .who{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px}
.essay-item .txt{font-size:13.5px;margin-top:7px;white-space:pre-wrap;overflow-wrap:anywhere;color:#33415f}
.essay-item .grade{display:flex;gap:6px;margin-left:auto}
.subrow{border:1px solid var(--line);border-radius:13px;background:#fff;margin-top:9px;overflow:hidden}
.subrow summary{list-style:none;display:grid;grid-template-columns:1.3fr 1fr .8fr .9fr 1fr auto;gap:10px;align-items:center;padding:13px 16px;cursor:pointer;font-size:13.5px}
.subrow summary::-webkit-details-marker{display:none}
.subrow summary:hover{background:#f8fafe}
.subrow[open] summary{background:#f7f9fe;border-bottom:1px solid var(--line)}
.subrow .sname{font-weight:700}
.subrow .sscore{font-weight:750;font-variant-numeric:tabular-nums}
.subrow .sdel{border:0;background:none;color:#b46a72;font-size:12.5px;cursor:pointer;font-weight:650}
.subdetail{padding:14px 16px;display:flex;flex-direction:column;gap:9px;background:#fbfcff}
.sd-row{font-size:13px;display:grid;grid-template-columns:1fr auto;gap:10px;padding-bottom:8px;border-bottom:1px dashed #e8edf7}
.sd-row:last-child{border-bottom:0;padding-bottom:0}
.sd-row .q{color:#3a4763;font-weight:600;overflow-wrap:anywhere}
.sd-row .a{color:var(--muted);font-size:12.5px;margin-top:3px;overflow-wrap:anywhere}
.sd-flag{font-weight:750;font-size:12.5px;white-space:nowrap}
.sd-flag.ok{color:var(--green)}.sd-flag.bad{color:var(--red)}.sd-flag.warn{color:var(--amber)}.sd-flag.gray{color:var(--muted)}
.sub-tools{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:18px;flex-wrap:wrap}
.stat.warn-stat{background:var(--amber-l);border-color:#f6e3b8}
.stat.warn-stat b{color:var(--amber)}
.sid-inline{font-weight:600;font-size:11.5px;color:#7a879f;background:#f0f3f9;border-radius:6px;padding:1px 6px;margin-left:6px;font-variant-numeric:tabular-nums;white-space:nowrap}
.process-outside{background:#fff6e2;color:#9a6400;border:1px solid #f6e3b8}
.old-badge{margin-left:6px}
.process{margin-top:15px;border-top:1px dashed #e3e9f5;padding-top:12px}
.process summary{list-style:none;cursor:pointer;display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-weight:750;font-size:13.5px;color:#33415f;padding:2px 0}
.process summary::-webkit-details-marker{display:none}
.process summary::before{content:"▸";color:#7a879f;font-size:11px;line-height:1;transition:transform .15s}
.process[open] summary::before{transform:rotate(90deg)}
.process-table-wrap{margin-top:10px;overflow-x:auto;overflow-y:auto;max-height:360px;border:1px solid var(--line);border-radius:11px;-webkit-overflow-scrolling:touch}
.process-table thead th{position:sticky;top:0;z-index:2;box-shadow:inset 0 -1px 0 var(--line)}
.process-table thead th:first-child{border-top-left-radius:10px}
.process-overview{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}
.pstat{background:#f7f9fe;border:1px solid var(--line);border-radius:10px;padding:8px 10px;text-align:center}
.pstat b{display:block;font-size:16px;font-weight:800;color:#2b3a5c;line-height:1.3}
.pstat b i{font-style:normal;font-size:11.5px;font-weight:600;color:var(--muted)}
.pstat span{font-size:11px;color:var(--muted)}
.process-tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:10px}
.process-chips{display:flex;gap:6px;flex-wrap:wrap}
.process-chip{border:1px solid var(--line);background:#fff;color:#33415f;border-radius:999px;padding:5px 12px;font-size:12px;font-weight:600;cursor:pointer;white-space:nowrap;transition:all .15s}
.process-chip:hover{border-color:var(--blue);color:var(--blue)}
.process-chip.active{background:var(--blue);border-color:var(--blue);color:#fff}
.process-chip:disabled{opacity:.4;cursor:not-allowed}
.process-search{flex:1;min-width:150px;max-width:260px;margin:0;padding:7px 12px;font-size:13px;height:auto}
.process-reset{flex:0 0 auto}
.process-count-line{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:8px 0 0}
.process-count{font-weight:750;font-size:13px;color:#33415f}
.process-table{width:100%;border-collapse:collapse;font-size:13px;min-width:400px}
.process-table th{background:#f7f9fe;color:var(--muted);font-size:11.5px;text-align:left;padding:8px 12px;border-bottom:1px solid var(--line);white-space:nowrap}
.process-table td{padding:9px 12px;border-bottom:1px solid #eef2f9;vertical-align:middle}
.process-table tbody tr:last-child td{border-bottom:0}
.process-table th:not(:first-child),.process-table td:not(:first-child){text-align:center;width:74px}
.process-name{display:flex;align-items:center;flex-wrap:wrap;font-size:13px;color:#2b3a5c}
.process-name b{font-weight:700}
.process-badge{display:inline-flex;margin-top:4px;font-size:10.5px;padding:2px 7px}
.process-summary-badge{font-size:10.5px;padding:2px 8px}
.process-legend{margin:-2px 0 4px}
.mark{display:inline-grid;place-items:center;width:25px;height:25px;border-radius:50%;font-weight:800;font-size:14px;line-height:1;vertical-align:middle}
.mark.ok{background:var(--green-l);color:var(--green)}
.mark.bad{background:var(--red-l);color:var(--red)}
.mark.none{background:#f3f5f9;color:#9aa5ba;font-size:11px;width:auto;min-width:25px;padding:0 5px;border-radius:7px}
.mark.wait{background:var(--amber-l);color:var(--amber);font-size:10.5px;width:auto;padding:0 6px;border-radius:7px}
.roster-missing{margin-top:12px}
.missing-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.missing-chip{display:inline-flex;align-items:center;gap:4px;background:#fff7e8;border:1px solid #f2dfb6;color:#7a5200;border-radius:999px;padding:7px 12px;font-size:12.5px;line-height:1.4}
.missing-chip b{color:#5c3d00}

/* ---------- 学生名单 ---------- */
.roster-summary{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.roster-toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:14px 16px;border-bottom:1px solid var(--line)}
.roster-toolbar .input{max-width:340px;flex:1 1 220px}
.roster-table-wrap{overflow-x:auto}
.roster-table{width:100%;border-collapse:collapse;font-size:13.5px;min-width:520px}
.roster-table th{background:#f7f9fe;color:var(--muted);font-size:12px;text-align:left;padding:10px 16px;border-bottom:1px solid var(--line);white-space:nowrap}
.roster-table td{padding:12px 16px;border-bottom:1px solid #eef2f9;vertical-align:middle}
.roster-table tbody tr:last-child td{border-bottom:0}
.roster-table tbody tr:hover{background:#fbfcff}
.roster-table .roster-sid{font-weight:750;font-variant-numeric:tabular-nums;color:#2b3a5c;white-space:nowrap}
.roster-table .row-actions{text-align:right;white-space:nowrap}
.import-warn{background:var(--amber-l);border:1px solid #f6e3b8;color:#7a5200;border-radius:11px;padding:10px 13px;font-size:12.5px;line-height:1.7;margin-top:12px}
.import-preview{max-height:280px;overflow:auto;border:1px solid var(--line);border-radius:12px;margin-top:14px}
.import-preview .roster-table{min-width:420px}
.import-preview .roster-table th{position:sticky;top:0;z-index:1}

/* ---------- 使用说明 ---------- */
.guide{font-size:14.5px;line-height:1.85;color:#2c3850}
.guide h3{font-size:17px;margin:26px 0 10px;padding-left:11px;border-left:4px solid var(--blue);line-height:1.3}
.guide h3:first-child{margin-top:0}
.guide ol,.guide ul{padding-left:22px;margin:8px 0}
.guide li{margin:5px 0}
.guide code{background:#eef2fa;border-radius:6px;padding:2px 6px;font-size:12.5px;color:#3358b8}
.guide .note{background:var(--amber-l);border:1px solid #f6e3b8;color:#7a5200;border-radius:12px;padding:13px 16px;font-size:13.5px;line-height:1.7;margin-top:18px}
.guide .info{background:var(--blue-l);border:1px solid #dbe5ff;color:#2f4c8f;border-radius:12px;padding:13px 16px;font-size:13.5px;line-height:1.7;margin-top:14px}

/* ---------- 学生端 ---------- */
body.student-mode{background:#f3f6fc}
.student-shell{max-width:720px;margin:0 auto;padding:16px 16px 130px}
.s-top{display:flex;align-items:center;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.s-top .s-title{font-weight:750;font-size:15px;color:#2b3a5c}
.s-top .badge{margin-left:auto}
.s-head{background:linear-gradient(125deg,#1a3a95,#3f6ff0);border-radius:18px;padding:20px 22px;color:#fff;margin-bottom:16px;box-shadow:0 10px 30px rgba(35,70,180,.22)}
.s-head h2{font-size:21px}
.s-head p{font-size:13.5px;color:#d7e2ff;margin-top:6px;line-height:1.65;white-space:pre-wrap}
.s-head .meta{display:flex;gap:8px;margin-top:12px;font-size:12.5px;color:#eaf0ff;flex-wrap:wrap}
.s-head .meta span{background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.22);border-radius:999px;padding:4px 10px}
.progress-wrap{margin:4px 0 16px}
.progress-info{display:flex;justify-content:space-between;font-size:12.5px;color:var(--muted);margin-bottom:7px;font-weight:650}
.progress{height:8px;background:#e5ebf8;border-radius:99px;overflow:hidden}
.progress > i{display:block;height:100%;background:linear-gradient(90deg,#3b6cf6,#6f96ff);border-radius:99px;transition:width .3s}
.qcard{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow);animation:fadeUp .22s ease-out}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.qcard .qmeta{display:flex;gap:7px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.stem{font-size:18px;line-height:1.85;font-weight:600;white-space:pre-wrap;overflow-wrap:anywhere}
.blank-paren{display:inline-block;white-space:nowrap}
.stem mjx-container{font-size:110%!important}
.opt{display:flex;align-items:flex-start;gap:13px;border:1.5px solid var(--line);border-radius:14px;padding:14px 16px;margin:11px 0;cursor:pointer;background:#fff;transition:border-color .15s,background .15s,box-shadow .15s;min-height:56px}
.opt:hover{border-color:#b9c9f7;background:#fbfcff}
.opt.selected{border-color:#5b82f0;background:var(--blue-l);box-shadow:0 0 0 3px rgba(59,108,246,.09)}
.opt input{width:19px;height:19px;margin:2px 0 0;accent-color:var(--blue);flex:0 0 auto}
.opt .opt-text{font-size:16px;line-height:1.65;overflow-wrap:anywhere}
.opt.correct{border-color:#41b98d;background:var(--green-l)}
.opt.correct::after{content:"✓";color:var(--green);font-weight:800;margin-left:auto}
.opt.wrong{border-color:#e28d95;background:#fff6f6}
.opt.wrong::after{content:"✕";color:var(--red);font-weight:800;margin-left:auto}
.opt input:disabled{cursor:not-allowed}
/* 4 个短选项：2×2 网格，贴近试卷版式；窄屏仍两列，过窄时回落单列 */
.opt-list.grid{display:grid;grid-template-columns:1fr 1fr;gap:10px 12px;align-items:stretch}
.opt-list.grid .opt{margin:0;min-height:54px;padding:13px 14px}
.opt-list.grid .opt .opt-text{font-size:16.5px}
/* 图片型选项：网格内改成竖排小卡——字母在上、图片居中在下、选择框挪到右上角，四张图并排对比 */
.opt-list.grid-imgs .opt{position:relative;flex-direction:column;align-items:center;gap:6px;padding:16px 12px 14px;text-align:center}
.opt-list.grid-imgs .opt input{position:absolute;top:10px;right:10px;margin:0;width:18px;height:18px}
.opt-list.grid-imgs .opt .opt-text{display:block;width:100%;font-size:14px}
.opt-list.grid-imgs .opt .opt-text b{display:inline-block;margin-bottom:4px;color:#5b6b8c}
.opt-list.grid-imgs .opt .opt-text .q-img{display:block;max-height:132px;max-width:100%;margin:2px auto 0}
.word-opts.grid-imgs{grid-template-columns:1fr 1fr;gap:10px 12px}
.word-opts.grid-imgs .word-opt{text-align:center}
.word-opts.grid-imgs .word-opt .q-img{display:block;max-height:120px;max-width:100%;margin:4px auto 0}
@media (max-width:340px){.opt-list.grid{grid-template-columns:1fr}}
.blank-input{font-size:17px;padding:14px 15px;border-radius:13px;margin-top:14px}
.essay-input{font-size:15.5px;min-height:150px;padding:14px 15px;border-radius:13px;margin-top:14px;line-height:1.75}
.feedback{border-radius:13px;padding:13px 16px;margin:16px 0 0;line-height:1.7;font-size:14.5px;border:1px solid transparent}
.feedback.good{background:var(--green-l);border-color:#c9ecdd;color:#0d6b4b}
.feedback.bad{background:var(--red-l);border-color:#f6d7da;color:#a3303a}
.feedback.note{background:var(--amber-l);border-color:#f5e2b5;color:#7b5300}
.feedback .fb-title{font-weight:800;margin-bottom:3px;font-size:15px}
.feedback .exp{margin-top:7px;font-size:14px;line-height:1.75}
.feedback .answer{margin-top:5px;font-weight:650}
.variant{border:1px dashed #cfd9ef;background:#f9fbff;border-radius:15px;padding:16px;margin-top:16px}
.variant .vtag{font-size:12.5px;font-weight:750;color:#566a94;margin-bottom:8px;display:flex;align-items:center;gap:6px}
.variant .stem{font-size:16px}
.variant .opt{padding:11px 14px;margin:8px 0;background:#fff}
.variant .opt .opt-text{font-size:15px}
.actionbar{position:fixed;left:0;right:0;bottom:0;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:12px 16px calc(12px + env(safe-area-inset-bottom));z-index:50}
.actionbar .inner{max-width:720px;margin:0 auto;display:flex;gap:10px}
.actionbar .btn{flex:1}
.timer{font-size:12.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.done-card{text-align:center;padding:38px 24px}
.done-icon{width:76px;height:76px;border-radius:50%;background:var(--green-l);color:var(--green);display:grid;place-items:center;font-size:38px;margin:0 auto 18px}
.done-card h2{font-size:23px}
.done-card .who{color:var(--muted);font-size:13.5px;margin-top:6px}
.done-card .stat-grid{margin-top:24px;text-align:left}
.done-card .status{font-size:13.5px;color:var(--muted);margin-top:20px}
.done-card .status.ok{color:var(--green)}
.done-card .status.bad{color:var(--red)}
.done-actions{display:flex;gap:10px;justify-content:center;margin-top:22px;flex-wrap:wrap}
.join-rules{background:#f7f9fe;border:1px solid #e9eefb;border-radius:14px;padding:14px 16px;margin-top:18px;font-size:13px;color:#4a5875;line-height:1.8}
.join-rules b{color:#2b3a5c}
.join-roster-note{display:flex;align-items:center;gap:9px;background:var(--green-l);border:1px solid #c9ecdd;color:#0d6b4b;border-radius:12px;padding:11px 13px;font-size:13px;line-height:1.6;margin-bottom:18px;flex-wrap:wrap}
.join-roster-note.preview-note{background:var(--amber-l);border-color:#f6e3b8;color:#7a5200}
.identity-input{font-size:18px;font-weight:650;letter-spacing:.3px}
.identity-status{display:none;font-size:13px;margin-top:9px;padding:10px 12px;border-radius:10px;line-height:1.6;overflow-wrap:anywhere}
.identity-status.ok{display:block;background:var(--green-l);color:#0d6b4b;border:1px solid #c9ecdd}
.identity-status.bad{display:block;background:var(--red-l);color:#a3303a;border:1px solid #f6d7da}
.identity-status.warn{display:block;background:var(--amber-l);color:#7a5200;border:1px solid #f6e3b8}
.loading{text-align:center;padding:60px 20px;color:var(--muted);font-size:14px}
.spinner{width:34px;height:34px;border:3px solid #dfe7f7;border-top-color:var(--blue);border-radius:50%;margin:0 auto 14px;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- 提示 ---------- */
.toast{position:fixed;left:50%;bottom:34px;transform:translate(-50%,20px);background:#1d2b4c;color:#fff;padding:11px 18px;border-radius:12px;font-size:13.5px;font-weight:600;box-shadow:0 10px 30px rgba(15,28,60,.3);opacity:0;pointer-events:none;transition:.22s;z-index:200;max-width:calc(100vw - 40px);text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media(max-width:980px){
  /* 窄屏（平板 / 手机横屏）看板改为单列，避免表格被挤压 */
  .dash-grid{grid-template-columns:1fr}
}
@media(max-width:375px){
  /* 超窄屏（360 及以下）进一步收起“关联试题”列，避免表格内部横向滚动 */
  .kp-table th:nth-child(3),.kp-table .col-relate{display:none}
}
@media(max-width:720px){
  .shell{padding:0 14px}
  .topbar{padding:18px 0 20px}
  .brand h1{font-size:19px}
  .tagline{font-size:12px}
  .top-right{width:100%;margin-left:0;margin-top:12px}
  main{padding:18px 0 60px}
  .card{padding:17px}
  .row2,.choice-grid{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
  .qitem{flex-wrap:wrap}
  .qitem-actions{max-width:none;width:100%;justify-content:flex-start;padding-left:46px}
  .savebar{position:static}
  .stats-tool{width:100%}
  .stats-tool select{max-width:none;width:auto;flex:1}
  .stats-toolbar select{flex:1 1 100%;max-width:none}
  /* 统计看板：手机端单列，圆环与数字缩小 */
  .dash-grid{grid-template-columns:1fr;gap:12px}
  .dash-head{padding:12px 14px 0}
  .dash-body{padding:12px 14px 14px;gap:10px}
  .donut-wrap{width:142px;height:142px}
  .donut-text b{font-size:23px}
  .dash-kpis b{font-size:17px}
  .dash-kpis span{font-size:11px}
  .dash-qstats>div{padding:7px 8px}
  .dash-qstats b{font-size:16px}
  .dash-table-wrap{max-height:300px}
  .dash-table th,.dash-table td{padding:7px 8px}
  .dash-table .col-mastery{min-width:120px}
  /* 手机端隐藏“操作”列（题型 Tab 已可直接切换），错题学生列吃掉剩余宽度 */
  .kp-table{table-layout:auto}
  .kp-table th:nth-child(1),.kp-table th:nth-child(3),.kp-table th:nth-child(4),.kp-table th:nth-child(5){width:auto}
  .kp-table .col-relate{width:auto}
  .kp-table .col-wrong{width:auto;min-width:0}
  .kp-table .col-mastery{min-width:104px}
  .kp-table th,.kp-table td{padding:7px 6px}
  .kp-table .mastery-sub{font-size:10px;line-height:1.35}
  .kp-table .col-relate{width:44px}
  .kp-table .relate-no{min-width:17px;height:17px;font-size:10px;margin-right:1px}
  .kp-table .col-op{display:none}
  .kp-table th:nth-child(5){display:none}
  .kp-table .col-wrong{min-width:auto}
  .kp-table .col-wrong .dash-name{font-size:10.5px;padding:2px 6px;margin:1px 2px 1px 0}
  .relate-no{min-width:18px;height:18px;font-size:10px;margin-right:3px}
  .stats-toolbar .btn{flex:1 1 auto}
  .subrow summary{grid-template-columns:1fr auto auto;grid-auto-rows:auto;gap:4px 8px}
  .subrow summary .hide-m{display:none}
  .subrow .sscore{justify-self:end}
  .stem{font-size:17px}
  /* 题目配图：手机屏幕窄，整图收小到 78% 并限制高度，避免一张图占满整屏 */
  .stem .q-img{max-width:78%;max-height:240px;margin:10px auto}
  .variant .stem .q-img{max-width:82%;max-height:200px}
  .qcard{padding:18px}
  .actionbar{padding:10px 14px calc(10px + env(safe-area-inset-bottom))}
  .modal-card{padding:18px;border-radius:16px}
  .overlay{padding:12px 10px}
  .bar-row{grid-template-columns:44px 1fr 74px;gap:8px}
  .process-table{min-width:0;font-size:12.5px}
  .process-table th,.process-table td{padding:8px 7px}
  .process-table th:not(:first-child),.process-table td:not(:first-child){width:44px}
  .process-badge{font-size:10px;padding:2px 6px}
  .process-overview{gap:6px}
  .pstat{padding:6px 6px}
  .pstat b{font-size:14px}
  .process-tools{flex-direction:column;align-items:stretch;gap:8px}
  .process-chips{justify-content:flex-start}
  .process-search{max-width:none}
  .student-shell{padding:12px 14px 120px}
  .classbar-inner{flex-wrap:wrap;gap:6px;padding:8px 0}
  .classbar-label{display:none}
  .class-chips{flex:1 1 100%;width:100%;flex-wrap:wrap;overflow:visible;gap:6px;padding-bottom:0}
  .class-chip{font-size:12px;padding:5px 9px;gap:4px}
  .class-chip .class-count{display:none}
  .classbar-tools{flex:1 1 100%;justify-content:flex-end;gap:6px}
  .classbar-tools .btn{padding:5px 10px;font-size:12px}
  .cls-tag{font-size:inherit;padding:1px 8px}
  .roster-toolbar{padding:12px 14px}
  .roster-toolbar .input{max-width:none;flex:1 1 100%}
  .roster-table{min-width:0;font-size:12.5px}
  .roster-table th,.roster-table td{padding-left:8px;padding-right:8px}
  .roster-table .btn.sm{padding:5px 8px;font-size:12px}
  .identity-input{font-size:17px}
  .join-roster-note{font-size:12.5px}
  .stat-grid{grid-template-columns:repeat(auto-fit,minmax(135px,1fr))}
  .stat.wide-mobile{grid-column:1/-1}
}

/* ---------- 老师端登录 ---------- */
.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px 18px;background:linear-gradient(160deg,#eef3ff 0%,#f7f9ff 45%,#eaf7f2 100%)}
.login-card{width:100%;max-width:420px;padding:32px 28px}
.login-logo{width:56px;height:56px;border-radius:18px;display:grid;place-items:center;font-size:28px;font-weight:800;color:#fff;background:linear-gradient(135deg,#2a53cc,#4a7cf7);box-shadow:0 10px 24px rgba(42,83,204,.25);margin-bottom:18px}
.login-card h2{font-size:22px}
.login-card .sub{color:var(--muted);font-size:13.5px;margin-top:8px}
.login-error{min-height:20px;color:var(--red);font-size:13px;font-weight:600;margin:10px 0 4px}

/* ---------- Word 导入预览 ---------- */
.modal-card.wide{max-width:760px}
.word-preview{max-height:46vh;overflow:auto;display:flex;flex-direction:column;gap:8px;margin:12px 0;padding-right:2px}
.word-q{border:1px solid var(--line);border-radius:12px;padding:9px 12px;font-size:13.5px;background:#fbfcff}
.word-q.skip{opacity:.55;background:#f6f7fa}
.word-q-head{display:flex;gap:8px;align-items:center;margin-bottom:4px;flex-wrap:wrap}
.word-stem{white-space:pre-wrap}
.word-opts{display:flex;flex-direction:column;gap:2px;margin-top:4px;padding-left:14px}
.word-opts.grid{display:grid;grid-template-columns:1fr 1fr;gap:2px 10px}
.word-opt{color:#3d4a68}
.word-ans{margin-top:5px;color:var(--green);font-weight:600}
.word-pick{display:flex;align-items:center;gap:6px;margin-top:7px;font-size:12px;color:var(--muted)}
.pick-btn{width:30px;height:25px;border:1.5px solid var(--line);background:#fff;border-radius:8px;font-weight:800;font-size:12px;color:#3d4a68;cursor:pointer;transition:all .15s}
.pick-btn:hover{border-color:#b9c9f7}
.pick-btn.on{background:var(--blue);border-color:var(--blue);color:#fff}
.word-exp{margin-top:2px;color:var(--muted);font-size:12.5px}
.word-warn{background:var(--amber-l);border:1px solid #ffe1a8;color:var(--amber);border-radius:10px;padding:7px 12px;font-size:12.5px;margin:10px 0;display:flex;flex-direction:column;gap:2px}
.word-tools{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:10px 0 2px}
.word-q-head .word-q-edit{margin-left:auto}

/* ---------- 二维码降级（组件不可用时展示可复制链接） ---------- */
.qr-fallback{padding:8px 2px;text-align:left}
.qr-fallback p{color:var(--muted);font-size:13.5px;margin-bottom:10px;line-height:1.6}
.qr-fallback .input{width:100%;font-size:13px;word-break:break-all}

/* ---------- Word 导入的题目配图 ---------- */
.q-img{display:block;max-width:100%;height:auto;margin:12px auto;border-radius:10px;background:#fff}
.stem-sm .q-img,.word-stem .q-img{max-height:260px;margin:8px auto}
.opt-text .q-img,.word-opt .q-img{display:inline-block;max-height:150px;margin:4px 0;vertical-align:middle}
@media print{.q-img{max-height:none}}

/* ---------- 讲评批注层（老师端 · 本地保存） ---------- */
.qstat{position:relative}
.qstat-head{padding-right:92px}
.annot-btn{position:absolute;top:10px;right:10px;z-index:3;height:30px;min-width:72px;padding:0 11px;
  border-radius:15px;border:1px solid var(--line);background:#fff;color:#5b7396;font-size:12.5px;font-weight:650;
  line-height:1;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:4px;
  white-space:nowrap;transition:all .15s;-webkit-tap-highlight-color:transparent}
.annot-btn .ico{font-size:14px;line-height:1}
.annot-btn:hover{border-color:#b9c9f7;color:#2563eb;background:#f5f8ff}
.annot-btn.has-ink{border-color:#f3c2cc;color:#e11d48;background:#fff5f7}
.annot-btn.has-ink::after{content:'';position:absolute;top:3px;right:3px;width:7px;height:7px;border-radius:50%;background:#e11d48}

.annot-host{position:relative}
.annot-host.annot-on{outline:2px solid #8fb4f2;outline-offset:5px;border-radius:10px}
.annot-host.annot-on .qstat-head .rate{color:#2563eb}

.annot-layer{position:absolute;inset:0;z-index:2;pointer-events:none;background:transparent}
.annot-layer:not(.readonly){pointer-events:auto}
.annot-canvas{position:absolute;inset:0;display:block;width:100%;height:100%;touch-action:none;
  -webkit-user-select:none;user-select:none;background:transparent}
/* 激光笔独立一层：不拦截指针，也不参与笔迹存取 */
.annot-laser-canvas{position:absolute;inset:0;z-index:1;display:block;width:100%;height:100%;
  pointer-events:none}
.annot-layer:not(.readonly) .annot-canvas{cursor:crosshair}
.annot-layer:not(.readonly) .annot-canvas.is-eraser,
.annot-layer:not(.readonly) .annot-canvas.is-laser{cursor:none}
body.annot-active{-webkit-user-select:none;user-select:none}

/* 橡皮圆环：直径与真正擦除范围一致，落笔前就能看清会擦掉多少 */
.annot-eraser-ring{position:fixed;z-index:9998;border-radius:50%;pointer-events:none;
  transform:translate(-50%,-50%);background:rgba(255,255,255,.22);
  border:2px solid rgba(17,24,39,.58);
  box-shadow:0 0 0 1.5px rgba(255,255,255,.95),0 3px 12px rgba(15,23,42,.20);
  will-change:left,top}
.annot-eraser-ring[hidden]{display:none}

/* 底部工具栏 */
.annot-bar{position:fixed;left:50%;bottom:calc(14px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);
  z-index:9999;display:flex;align-items:center;gap:5px;padding:7px 8px;border-radius:16px;
  background:rgba(255,255,255,.97);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  box-shadow:0 12px 34px rgba(20,35,70,.20),0 0 0 1px rgba(20,35,70,.06);
  width:max-content;max-width:calc(100vw - 16px);overflow:hidden}
/* 工具区可横向滑动，「完成」始终钉在右边，手机上也点得到 */
.annot-scroll{display:flex;align-items:center;gap:5px;flex:1 1 auto;min-width:0;
  overflow-x:auto;overflow-y:hidden;scrollbar-width:none;-ms-overflow-style:none}
.annot-scroll::-webkit-scrollbar{display:none}
.annot-bar button{flex:0 0 auto;height:38px;min-width:38px;padding:0 10px;border:1px solid transparent;border-radius:10px;
  background:transparent;color:#2c3e5c;font-size:13px;font-weight:650;white-space:nowrap;cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;gap:5px;
  -webkit-tap-highlight-color:transparent;transition:all .12s}
.annot-bar button:hover{background:#f2f6fd}
.annot-bar button:disabled{opacity:.38;cursor:default}
.annot-bar button:disabled:hover{background:transparent}
.annot-bar button.on{background:#eaf1ff;border-color:#c3d8fa;color:#1b4fa8}
.annot-bar button.annot-keep{flex:0 0 auto}
.annot-bar button.annot-done{flex:0 0 auto;background:#2563eb;border-color:#2563eb;color:#fff;font-weight:750;padding:0 16px}
.annot-bar button.annot-done:hover{background:#1d54c9}
.annot-sep{flex:0 0 auto;width:1px;height:22px;background:#e6ecf7;margin:0 2px}
.annot-tools,.annot-widths{display:flex;align-items:center;gap:4px;flex:0 0 auto}
.annot-ico{display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto}
.annot-ico svg{width:17px;height:17px;display:block;fill:none;stroke:currentColor;stroke-width:1.8;
  stroke-linecap:round;stroke-linejoin:round;pointer-events:none}
.annot-lbl{display:inline-block}
.annot-widths button{min-width:34px;padding:0 8px;font-weight:600}

/* 颜色按钮：当前色点 + 抽拉箭头 */
.annot-color-btn{gap:6px}
.annot-color-dot{width:18px;height:18px;flex:0 0 auto;border-radius:50%;background:var(--sw,#e11d48);
  box-shadow:inset 0 0 0 1px rgba(15,23,42,.12),0 0 0 2px #fff,0 0 0 3px rgba(20,35,70,.10)}
.annot-caret{font-size:9px;line-height:1;color:#8fa0bb;transition:transform .15s}
.annot-color-btn.on .annot-caret{transform:rotate(180deg)}

/* 颜色抽拉面板 */
.annot-palette{position:fixed;left:50%;bottom:calc(74px + env(safe-area-inset-bottom,0px));
  transform:translateX(-50%);z-index:10002;width:min(342px,calc(100vw - 20px));
  max-height:calc(100vh - 120px);overflow-y:auto;padding:12px 12px 10px;border-radius:18px;
  background:rgba(255,255,255,.985);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  box-shadow:0 20px 52px rgba(20,35,70,.24),0 0 0 1px rgba(20,35,70,.07);
  animation:annotPaletteIn .16s ease-out}
@keyframes annotPaletteIn{from{opacity:0;transform:translate(-50%,9px) scale(.97)}
  to{opacity:1;transform:translate(-50%,0) scale(1)}}
.annot-palette-head{display:flex;align-items:center;justify-content:space-between;margin:0 2px 9px}
.annot-palette-title{font-size:13px;font-weight:750;color:#22314d;letter-spacing:.2px}
.annot-palette-close{width:30px;height:30px;padding:0;border:none;border-radius:9px;
  background:transparent;color:#8a9ab2;font-size:14px;line-height:1;cursor:pointer;
  transition:all .12s;-webkit-tap-highlight-color:transparent}
.annot-palette-close:hover{background:#f2f6fd;color:#2c3e5c}
.annot-swatches{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}
.annot-swatch{position:relative;display:block;width:100%;height:auto;aspect-ratio:1/1;padding:0;
  border:none;border-radius:50%;
  background:var(--sw);cursor:pointer;box-shadow:inset 0 0 0 1px rgba(15,23,42,.10);
  transition:transform .1s;-webkit-tap-highlight-color:transparent}
.annot-swatch:hover{transform:scale(1.06)}
.annot-swatch.on::after{content:'';position:absolute;inset:-3px;border-radius:50%;
  border:2px solid #2563eb;box-shadow:0 0 0 1px #fff}
.annot-recent-row{display:flex;align-items:center;gap:8px;margin-top:11px;min-height:26px}
.annot-row-label{font-size:11px;color:#8494ac;font-weight:650;flex:0 0 auto}
.annot-recent{display:flex;align-items:center;gap:6px;flex:1 1 auto;min-width:0;overflow:hidden}
.annot-recent .annot-swatch{width:24px;min-width:24px;height:24px;flex:0 0 auto;border-radius:50%}
.annot-recent .annot-swatch:hover{transform:scale(1.1)}
.annot-recent .annot-swatch.on::after{inset:-3px;border-radius:50%}
.annot-recent-empty{font-size:11px;color:#b3bfd0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.annot-palette-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin-top:11px;padding-top:10px;border-top:1px solid #eef2f9}
.annot-custom{position:relative;display:inline-flex;align-items:center;gap:6px;height:34px;
  padding:0 11px 0 6px;border-radius:10px;background:#f4f7fe;color:#33507c;
  font-size:12px;font-weight:650;cursor:pointer;overflow:hidden;-webkit-tap-highlight-color:transparent}
.annot-custom:hover{background:#eaf1ff}
.annot-custom input{position:absolute;inset:0;width:100%;height:100%;opacity:0;border:none;padding:0;cursor:pointer}
.annot-custom-plus{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;
  border-radius:50%;background:#fff;color:#4b6a9b;font-size:15px;line-height:1;
  box-shadow:inset 0 0 0 1px #dbe4f3}
.annot-current-color{display:inline-flex;align-items:center;gap:6px;font-size:11px;color:#8494ac;flex:0 0 auto}
.annot-current-color i{width:16px;height:16px;border-radius:50%;background:var(--sw);
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.12)}
.annot-current-color b{font-weight:650;color:#5a6b85;font-size:10.5px;letter-spacing:.2px;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}

/* 平板竖屏（iPad 768/820/834）先收起粗细档，给清空/撤销留出位置，避免工具栏横向溢出 */
@media(max-width:900px){
  .annot-widths{display:none}
}

@media(max-width:720px){
  .annot-bar{gap:3px;padding:6px;border-radius:14px}
  .annot-scroll{gap:3px}
  .annot-bar button{height:34px;min-width:34px;padding:0 6px;font-size:12.5px}
  .annot-bar button.annot-done{padding:0 11px}
  .annot-bar .annot-lbl{display:none}
  .annot-tools,.annot-widths{gap:3px}
  .annot-sep{margin:0;height:20px}
  .annot-color-btn{padding:0 5px;gap:0}
  .annot-caret{display:none}
  .annot-color-dot{width:18px;height:18px}
  .annot-ico svg{width:17px;height:17px}
  .annot-widths{display:none}
  .annot-palette{bottom:calc(70px + env(safe-area-inset-bottom,0px));padding:11px 11px 9px;border-radius:16px;
    width:min(338px,calc(100vw - 16px))}
  .annot-swatches{gap:7px}
  .annot-swatch{border-radius:50%}
  .annot-recent-row{margin-top:9px}
  .annot-palette-foot{margin-top:9px;padding-top:9px}
  .annot-custom{height:32px}
  .annot-btn{width:36px;min-width:36px;height:36px;padding:0;border-radius:50%}
  .annot-btn .ico{font-size:15px}
  .annot-btn .t{display:none}
  .qstat-head{padding-right:48px}
}

/* 360/375 小屏：再收紧间隙、放宽外框，保证清空与撤销都在一屏内，不出现横向滚动 */
@media(max-width:380px){
  .annot-bar{gap:1px;padding:5px;max-width:calc(100vw - 8px)}
  .annot-scroll{gap:2px}
  .annot-tools{gap:2px}
  .annot-bar button.annot-done{padding:0 9px}
}

/* 手机、平板、电脑共用同一批注能力；小屏沿用上方紧凑工具栏与圆形入口。 */

/* ===== 统计升级：知识点 / 学情诊断 / 错题集中度 / 教学建议 ===== */
.stats-block{margin-top:22px}
.stats-block .section-head{margin-top:0}
.badge.kp{background:#eef3ff;color:#2f56b5;border:1px solid #dbe5fb;max-width:100%;overflow:hidden;text-overflow:ellipsis}

/* 知识点表：知识点 / 掌握率 / 关联试题 / 未掌握 / 错题学生 / 操作 */
.kp-table{table-layout:fixed}
.kp-table th:nth-child(1){width:100px}
.kp-table th:nth-child(2){width:118px}
.kp-table th:nth-child(3){width:52px}
.kp-table th:nth-child(4){width:54px}
.kp-table th:nth-child(5){width:auto}
.kp-table th:nth-child(6){width:58px}
.kp-table .col-type{white-space:normal;word-break:break-word}
.kp-table .mastery{gap:6px}
.kp-table .mastery-track{min-width:38px}
.kp-table .mastery-sub{white-space:normal;line-height:1.35}
.kp-table .col-names{width:auto;min-width:0}
.kp-table .col-names .dash-name{max-width:100%;overflow:hidden;text-overflow:ellipsis;display:inline-block;vertical-align:top}
.kp-table tbody tr[data-act]{cursor:pointer}
.kp-table .col-op{padding-left:2px;padding-right:6px;text-align:right}
.kp-table .col-op .btn{padding:5px 6px;font-size:12px;min-height:28px;border-radius:8px}
.kp-table tbody tr.is-open{background:#f3f7ff}
.kp-table tbody tr.is-open td{border-bottom-color:#dbe5fb}
.mastery-track i.low{background:linear-gradient(90deg,#ffb4a6,#ef6a55)}

.kp-detail{margin-top:12px;border:1px solid #dbe5fb;border-radius:12px;background:#fafcff;padding:14px}
.kp-detail-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.kp-detail-head h4{font-size:14px;color:#1d2c4d}
.kp-questions{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.kp-q{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid #e2e9f7;border-radius:9px;padding:6px 10px;font-size:12px;color:#5d6b86}
.kp-q b{color:#2b3a5c;font-size:12px}
.kp-q i{font-style:normal;font-weight:750;color:#2f56b5}
.kp-q em{font-style:normal;color:#8b97ad;font-size:11px}
.kp-matrix-wrap{max-height:320px;background:#fff}
.kp-matrix td,.kp-matrix th{padding:7px 9px}
.kp-matrix td:not(.col-name){text-align:center}
.kp-matrix .col-score{text-align:center}
.cell-ok{color:#1f9d63;font-weight:800}
.cell-bad{color:#d9493f;font-weight:800}
.c-bad{color:#d9493f}
.c-ok{color:#1f9d63;font-weight:700}

/* 学情诊断 */
.diag-card{padding:14px 18px 16px}
.diag-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.diag-tile{appearance:none;text-align:left;background:#f7f9fe;border:1px solid #e5ecf9;border-radius:12px;padding:12px 13px;
  display:flex;flex-direction:column;gap:2px;cursor:pointer;transition:.15s;font-family:inherit;min-width:0}
.diag-tile:hover{background:#eef4ff;border-color:#c9d9f8}
.diag-tile.active{background:#e9f0ff;border-color:#7ba2ff;box-shadow:0 0 0 2px rgba(59,108,246,.12)}
.diag-tile b{font-size:22px;line-height:1.15;color:#1d2c4d;font-variant-numeric:tabular-nums}
.diag-tile span{font-size:12px;color:#5d6b86;font-weight:700}
.diag-tile i{font-style:normal;font-size:11px;color:#8b97ad}
.diag-detail{margin-top:12px;border:1px solid #dbe5fb;border-radius:11px;background:#fafcff;padding:12px}
.diag-detail-head{display:flex;align-items:baseline;justify-content:space-between;gap:8px;margin-bottom:9px;flex-wrap:wrap}
.diag-detail-head b{font-size:13px;color:#1d2c4d}
.diag-hint{margin:2px 0 0}

/* 分数段柱状图 */
.band-chart{margin-top:14px;display:flex;flex-direction:column;gap:7px}
.band-row{display:grid;grid-template-columns:58px minmax(0,1fr) 96px;align-items:center;gap:10px;
  background:none;border:1px solid transparent;border-radius:9px;padding:5px 7px;cursor:pointer;font-family:inherit;transition:.15s}
.band-row:hover{background:#f5f8ff;border-color:#e2e9f7}
.band-row.active{background:#edf3ff;border-color:#b9cdf3}
.band-label{font-size:11.5px;color:#5d6b86;font-weight:700;white-space:nowrap}
.band-track{display:block;height:14px;border-radius:99px;background:#eef2fa;overflow:hidden}
.band-fill{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#7ba2ff,#3b6cf6);transition:width .25s}
.band-fill.bad{background:linear-gradient(90deg,#ffb4a6,#ef6a55)}
.band-fill.warn{background:linear-gradient(90deg,#ffd98a,#f0a92c)}
.band-fill.ok{background:linear-gradient(90deg,#8fd0a8,#37a86a)}
.band-fill.good{background:linear-gradient(90deg,#4f8df8,#1f4fd0)}
.band-count{font-size:12px;color:#2b3a5c;font-weight:750;white-space:nowrap;text-align:right}
.band-count em{font-style:normal;font-weight:600;color:#8b97ad;font-size:11px;margin-left:5px}

/* 错题集中度 */
.focus-list{display:flex;flex-direction:column;gap:9px}
.focus-row{background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);overflow:hidden}
.focus-summary{display:grid;grid-template-columns:auto minmax(0,1fr) auto auto auto 14px;align-items:center;gap:10px;
  padding:11px 15px;cursor:pointer;list-style:none}
.focus-summary::-webkit-details-marker{display:none}
.focus-summary::after{content:"⌄";color:#8b97ad;font-size:13px;transition:.2s;justify-self:end}
.focus-row[open] .focus-summary::after{transform:rotate(180deg)}
.focus-row[open] .focus-summary{border-bottom:1px solid #eef2f9;background:#fafcff}
.focus-no{font-size:12px;font-weight:800;color:#2f56b5;white-space:nowrap}
.focus-stem{font-size:12.5px;color:#41506e;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.focus-rate{font-size:12px;font-weight:750;color:#5d6b86;white-space:nowrap}
.focus-rate.bad{color:#d9493f}
.focus-rate.warn{color:#c47c12}
.focus-rate.ok{color:#1f9d63}
.focus-meta{font-size:11.5px;color:#8b97ad;white-space:nowrap;justify-self:end}
.focus-meta b{color:#d9493f}
.focus-body{padding:13px 15px 15px;display:flex;flex-direction:column;gap:11px}
.focus-qstem{font-size:13.5px;color:#2b3a5c;line-height:1.65;overflow-wrap:anywhere}
.focus-qstem img{max-width:100%;height:auto}
/* ===== 选项分布：横向四列小卡（图/字母/人数/比例，正确绿色） ===== */
.opt-tiles{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:14px}
.opt-tile{border:1.5px solid var(--line);border-radius:12px;background:#fff;padding:10px 8px;display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;min-width:0}
.opt-tile.right{border-color:#3aa76d;background:#f1fbf5;box-shadow:0 0 0 2px rgba(47,168,107,.12)}
.opt-tile-key{font-size:13.5px;font-weight:800;color:#5a687f}
.opt-tile.right .opt-tile-key{color:#1f7a4d}
.opt-tile-body{width:100%;min-height:22px;font-size:14px;line-height:1.5;color:#2b3a5c;overflow-wrap:anywhere}
.opt-tile-body .q-img{display:block;max-height:92px;max-width:100%;margin:0 auto;border-radius:8px;background:#fff}
.opt-tile-bar{display:block;width:100%;height:6px;border-radius:99px;background:#eef2fa;overflow:hidden}
.opt-tile-bar i{display:block;height:100%;border-radius:99px;background:#aebfe0;min-width:2px}
.opt-tile.right .opt-tile-bar i{background:linear-gradient(90deg,#7ad0a0,#2fa86b)}
.opt-tile-meta{font-size:12px;color:#5d6b86;font-variant-numeric:tabular-nums}
.opt-tile-meta b{color:#33415e;font-size:13px}
.opt-tile.right .opt-tile-meta,.opt-tile.right .opt-tile-meta b{color:#1f7a4d}
@media (max-width:560px){.opt-tiles{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.opt-tile-body .q-img{max-height:80px}}

/* ===== 错题集中度：横向柱状图 ===== */
.conc-chart{display:flex;flex-direction:column;gap:9px;margin-top:14px}
.conc-row{background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);overflow:hidden}
.conc-summary{display:grid;grid-template-columns:26px minmax(90px,1.4fr) minmax(0,3fr) auto auto 14px;align-items:center;gap:12px;padding:12px 15px;cursor:pointer;list-style:none}
.conc-summary::-webkit-details-marker{display:none}
.conc-summary::after{content:"⌄";color:#8b97ad;font-size:13px;transition:.2s;justify-self:end}
.conc-row[open] .conc-summary::after{transform:rotate(180deg)}
.conc-row[open] .conc-summary{border-bottom:1px solid #eef2f9;background:#fafcff}
.conc-rank{font-size:12px;font-weight:800;color:#9aa6bd;text-align:center}
.conc-name{font-size:13px;font-weight:750;color:#2f3f5f;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conc-sub{font-weight:500;color:#8b97ad;font-size:12px}
.conc-bar{display:block;height:14px;border-radius:99px;background:#eef2fa;overflow:hidden;min-width:0}
.conc-bar i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#f0a94b,#e0663f);min-width:6px}
.conc-val{font-size:12.5px;color:#5d6b86;white-space:nowrap;font-variant-numeric:tabular-nums}
.conc-val b{color:#d9493f;font-size:14px}
.conc-body{padding:13px 15px 15px;display:flex;flex-direction:column;gap:12px}
.conc-q{position:relative;border:1px solid #eef2f9;border-radius:12px;padding:11px 13px;background:#fbfcff}
.conc-q-head{display:flex;align-items:baseline;gap:10px;margin-bottom:4px;padding-right:84px}
.conc-q-head b{font-size:13px;color:#2f56b5}
.conc-qstem{font-size:13.5px;color:#2b3a5c;line-height:1.65;overflow-wrap:anywhere}
.conc-qstem img,.conc-qstem .q-img{max-width:100%;height:auto}
.conc-empty{margin-top:14px;border:1px dashed #d7e0f0;border-radius:14px;background:#fafcff;padding:28px 16px;text-align:center;color:#5d6b86}
.conc-empty p{margin:6px 0 2px;font-size:15px;font-weight:700;color:#33415e}
.conc-empty-ico{font-size:26px;color:#aebadb;line-height:1}
.conc-empty.good{border-color:#bfe6cf;background:#f4fbf6}
.conc-empty.good .conc-empty-ico{color:#2fa86b}
.conc-empty.good p{color:#1f7a4d}
@media (max-width:720px){
  .conc-summary{grid-template-columns:auto minmax(0,1fr) auto;grid-auto-rows:auto;gap:4px 10px;padding:11px 13px}
  .conc-rank{grid-row:1;grid-column:1}
  .conc-name{grid-row:1;grid-column:2/4;white-space:normal}
  .conc-bar{grid-row:2;grid-column:1/4;height:12px}
  .conc-val{grid-row:3;grid-column:1/3;justify-self:start}
  .conc-summary .badge{grid-row:3;grid-column:3;justify-self:end}
  .conc-summary::after{display:none}
}

/* 教学建议 */
.advice-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.advice-card{background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:14px 16px}
.advice-card h4{font-size:13.5px;color:#1d2c4d;margin-bottom:8px;display:flex;align-items:center;gap:7px}
.advice-card h4::before{content:"";width:3px;height:13px;border-radius:2px;background:#8fa9d8}
.advice-card ul{list-style:none;display:flex;flex-direction:column;gap:7px}
.advice-card li{font-size:12.5px;line-height:1.7;color:#41506e;padding-left:12px;position:relative;overflow-wrap:anywhere}
.advice-card li::before{content:"·";position:absolute;left:2px;color:#8fa9d8;font-weight:800}
.advice-card.primary{border-color:#c9d9f8;background:linear-gradient(180deg,#fbfdff,#f4f8ff)}
.advice-card.primary h4::before{background:#3b6cf6}
.advice-card.primary li::before{color:#3b6cf6}

@media(max-width:980px){
  .diag-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
  .advice-grid{grid-template-columns:1fr}
}
@media(max-width:720px){
  .diag-card{padding:12px 14px 14px}
  .diag-grid{grid-template-columns:1fr 1fr;gap:8px}
  .diag-tile{padding:10px 11px}
  .diag-tile b{font-size:19px}
  .band-row{grid-template-columns:52px minmax(0,1fr) 82px;gap:7px;padding:5px 4px}
  .band-count{font-size:11.5px}
  .focus-summary{grid-template-columns:auto auto minmax(0,1fr);grid-auto-rows:auto;gap:4px 8px;padding:10px 12px}
  .focus-stem{grid-column:1/-1;white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .focus-summary::after{display:none}
  .focus-meta{justify-self:start;grid-column:1/-1;white-space:normal}
  .focus-body{padding:11px 12px 13px}
  .optdist-row{grid-template-columns:36px minmax(0,1fr) 86px;gap:7px}
  .kp-detail{padding:11px}
  .kp-questions{gap:6px}
  .kp-q{padding:5px 8px;font-size:11.5px}
  /* 手机端知识点表：保留 知识点 / 掌握率 / 未掌握人数，其余收起，点击行看完整详情 */
  .kp-table{table-layout:auto}
  .kp-table th:nth-child(1),.kp-table th:nth-child(2),.kp-table th:nth-child(3),.kp-table th:nth-child(4),.kp-table th:nth-child(5),.kp-table th:nth-child(6){width:auto}
  .kp-table th:nth-child(3),.kp-table .col-relate{display:none}
  .kp-table th:nth-child(5),.kp-table th:nth-child(6){display:none}
  .kp-table .col-names,.kp-table .col-op{display:none}
  .kp-table th,.kp-table td{padding:8px 7px}
  .kp-table .col-mastery{min-width:118px}
  .kp-table .mastery-sub{font-size:10px;line-height:1.35}
}
@media(max-width:375px){
  .diag-grid{grid-template-columns:1fr 1fr}
  .diag-tile b{font-size:17px}
  .advice-card{padding:12px 13px}
}

/* 手机端：题干图片收小，避免一张图占屏影响题干阅读（置于末尾以覆盖上面的桌面高度） */
@media(max-width:720px){
  .stem-sm .q-img{max-width:60%;max-height:150px;margin:8px auto}
  .conc-qstem .q-img{max-width:70%;max-height:200px;margin:8px auto}
}

/* ---------- 图片点击放大预览 light-box ---------- */
.imgbox{position:fixed;inset:0;z-index:9999;display:flex;align-items:center;justify-content:center;
  background:rgba(6,10,18,.88);opacity:0;pointer-events:none;
  transition:opacity .18s ease;touch-action:none;overscroll-behavior:contain}
.imgbox.on{opacity:1;pointer-events:auto}
.imgbox-stage{width:100%;height:100%;display:flex;align-items:center;justify-content:center;overflow:hidden}
.imgbox-img{max-width:90%;max-height:70vh;max-height:70svh;object-fit:contain;
  transform-origin:center center;will-change:transform;background:#fff;border-radius:8px;
  user-select:none;-webkit-user-select:none;-webkit-user-drag:none;box-shadow:0 8px 40px rgba(0,0,0,.45)}
.imgbox-close{position:absolute;top:calc(env(safe-area-inset-top,0px) + 14px);right:16px;z-index:2;
  width:40px;height:40px;border-radius:50%;border:none;cursor:pointer;
  background:rgba(255,255,255,.16);color:#fff;font-size:20px;line-height:1;
  display:flex;align-items:center;justify-content:center}
.imgbox-close:active{background:rgba(255,255,255,.32)}
.imgbox-lock{overflow:hidden}
@media print{.imgbox{display:none !important}}

/* 圆周角定理：题目配图统一外框（固定宽高，按比例缩放居中，不拉伸不裁切）
   高宽比略大于所有原图（最窄 0.86），因此每张图都按“宽度”统一缩放，圆形大小一致。 */
.img-std .stem-sm .q-img,
.img-std .conc-qstem .q-img,
.img-std .stem .q-img{
  display:block;
  width:160px;
  height:188px;
  max-width:100%;
  max-height:none;
  object-fit:contain;
  object-position:center center;
  margin:10px auto;
  background:#fff;
}
@media(min-width:721px){
  .img-std .stem-sm .q-img,
  .img-std .conc-qstem .q-img,
  .img-std .stem .q-img{
    width:190px;
    height:222px;
  }
}

/* 错题集中度题卡内的批注按钮：手机端是圆形图标，标题只需让出 46px */
@media(max-width:720px){
  .conc-q-head{padding-right:46px}
  .conc-q .annot-btn{top:8px;right:8px}
}

/* ===== 知识点掌握情况 v2：多选关联 / 学生口径 / 横向题号 / 错题折叠 ===== */
/* 不随右侧「学生成绩」卡等高拉伸：空状态或少量知识点时下方不留大片空白 */
.dash-card.kp-card{overflow:visible;align-self:start}
/* 知识点行数少，全部展开显示；避免表格内部滚动把最后一行藏起来 */
.dash-card.kp-card .dash-table-wrap{max-height:none}
.kp-head{align-items:flex-start}
.kp-info-wrap{position:relative;display:inline-flex;align-items:center}
.kp-info-btn{border:0;background:transparent;color:#8b97ad;font-size:15px;line-height:1;cursor:pointer;padding:2px 5px;border-radius:7px}
.kp-info-btn:hover{background:#eef3ff;color:#2f56b5}
.kp-info-pop{position:fixed;top:80px;left:16px;z-index:120;width:340px;max-width:calc(100vw - 24px);background:#fff;border:1px solid #dbe5fb;border-radius:13px;box-shadow:0 16px 44px rgba(20,40,90,.20);padding:14px 15px;font-size:12px;color:#4a5875;line-height:1.65}
.kp-info-pop b{color:#22345a}
.kp-info-pop p{margin:0 0 7px}
.kp-info-pop p:last-child{margin-bottom:0}
.kp-info-pop[hidden],.kp-menu[hidden],.kp-option[hidden],.kp-create[hidden],.kp-none[hidden]{display:none !important}
.kp-thresholds{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin:9px 0 6px;padding-top:9px;border-top:1px dashed #e3eaf7}
.kp-thresholds label{display:inline-flex;align-items:center;gap:4px;font-size:12px;color:#5d6b86;white-space:nowrap}
.kp-thresholds input{width:54px;height:28px;border:1px solid #dbe5fb;border-radius:7px;padding:0 6px;font-size:12px;color:#2b3a5c;background:#fbfcff;font-family:inherit}
.kp-info-foot{color:#8b97ad;font-size:11px}
.kp-link{border:0;background:transparent;color:#2f56b5;font-weight:700;font-size:12px;cursor:pointer;padding:0 2px;text-decoration:underline;text-underline-offset:2px;font-family:inherit}
.kp-empty{display:flex;align-items:center;gap:12px;flex-wrap:wrap;background:#f7f9fe;border:1px dashed #cddbf5;border-radius:12px;padding:16px}
.kp-empty-icon{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:#eef3ff;color:#2f56b5;font-size:20px;flex:0 0 auto}
.kp-empty>div{flex:1;min-width:170px}
.kp-empty p{font-size:12.5px;color:#6b7895;line-height:1.65}
.kp-empty .btn{margin-left:auto;flex:0 0 auto}

.kp-table-v2{table-layout:fixed;min-width:0}
.kp-table-v2 th:nth-child(1){width:104px}
.kp-table-v2 th:nth-child(2){width:154px}
.kp-table-v2 th:nth-child(3){width:78px}
.kp-table-v2 th:nth-child(4){width:auto}
.kp-table-v2 .col-type{white-space:normal;word-break:break-word}
.kp-table-v2 .col-type .badge.kp{white-space:normal;line-height:1.35;vertical-align:middle}
.kp-table-v2 .col-mastery{width:154px;min-width:0}
.kp-table-v2 .col-relate{width:78px}
.kp-table-v2 .col-names{width:auto;min-width:0}
.kp-row-toggle{display:inline-flex;align-items:center;justify-content:center;width:16px;height:16px;padding:0;margin-right:3px;border:0;background:transparent;color:#8b97ad;font-size:12px;line-height:1;cursor:pointer;border-radius:4px;vertical-align:middle;font-family:inherit}
.kp-row-toggle:hover{background:#eef3ff;color:#2f56b5}
.kp-table-v2 tr.is-open .kp-row-toggle{color:#2f56b5}
.kp-table-v2 .col-names .dash-name{display:inline-flex;max-width:100%;overflow:hidden;text-overflow:ellipsis;vertical-align:top;margin:1px 3px 1px 0}
.kp-table-v2 .kp-names .dash-name.extra{display:none}
.kp-table-v2 .kp-names.open .dash-name.extra{display:inline-flex}
.kp-table-v2 .kp-more{border:1px solid #dbe5fb;background:#eef3ff;color:#2f56b5;cursor:pointer;font-family:inherit;line-height:inherit}
.kp-table-v2 .mastery{gap:6px}
.kp-table-v2 .mastery-sub>span{white-space:nowrap}
.kp-table-v2 .mastery-track{min-width:44px}
.mastery-track i.tier-good{background:linear-gradient(90deg,#8fe0bd,#1f9d63)}
.mastery-track i.tier-ok{background:linear-gradient(90deg,#a9c1ff,#2f6bff)}
.mastery-track i.tier-mid{background:linear-gradient(90deg,#ffd49a,#e08a2f)}
.mastery-track i.tier-bad{background:linear-gradient(90deg,#ffb4a6,#e4443f)}
.mastery-track i.tier-none{background:#dfe6f2}
.mastery span.tier-good{color:#1f9d63}
.mastery span.tier-ok{color:#2f6bff}
.mastery span.tier-mid{color:#e08a2f}
.mastery span.tier-bad{color:#e4443f}
.mastery-sub .c-ok{color:#1f9d63;font-weight:750}
.mastery-sub .c-warn{color:#e08a2f;font-weight:750}
.relate-chips{display:flex;flex-wrap:nowrap;gap:4px;overflow-x:auto;max-width:100%;padding-bottom:2px;scrollbar-width:thin}
.relate-chips .relate-no{flex:0 0 auto;margin:0}
.kp-matrix .col-rate{white-space:nowrap;font-variant-numeric:tabular-nums;text-align:center}
.kp-matrix .col-rate b{font-size:13px;color:#1d2c4d}
.kp-matrix .col-rate i{display:block;font-style:normal;font-size:10px;color:#96a2b8}
.kp-matrix .col-status{white-space:nowrap;text-align:center}
.c-warn{color:#e08a2f}

/* 题卡详情里的知识点行 */
.dash-kp-row{display:flex;align-items:center;gap:7px;flex-wrap:wrap;min-width:0}
.dash-kp-label{font-size:11px;font-weight:750;color:#8b97ad;flex:0 0 auto}
.dash-kp-tags{display:flex;align-items:center;gap:5px;flex-wrap:wrap;min-width:0}
.dash-kp-tags .badge.kp{font-size:10.5px;padding:2px 7px}
.dash-kp-row .btn{padding:4px 8px;min-height:26px;font-size:11.5px;border-radius:7px}

/* 知识点多选下拉 */
.kp-picker{position:relative;border:1.5px solid #dfe7f7;border-radius:11px;background:#fff;transition:border-color .15s,box-shadow .15s}
.kp-picker:focus-within,.kp-picker[data-open="1"]{border-color:#7b9bf8;box-shadow:0 0 0 3px rgba(59,108,246,.10)}
.kp-control{display:flex;align-items:center;gap:5px;flex-wrap:wrap;padding:7px 30px 7px 8px;min-height:42px;cursor:text;position:relative}
.kp-chips{display:contents}
.kp-chip{display:inline-flex;align-items:center;gap:4px;max-width:100%;background:#eef3ff;border:1px solid #dbe5fb;color:#2f56b5;border-radius:7px;padding:2px 3px 2px 8px;font-size:12px;font-weight:650;line-height:1.45;white-space:normal}
.kp-chip-x{border:0;background:transparent;color:#8fa3c9;font-size:11px;line-height:1;cursor:pointer;padding:3px;border-radius:4px;font-family:inherit;flex:0 0 auto}
.kp-chip-x:hover{background:#dbe5fb;color:#2f56b5}
.kp-placeholder{color:#a0abc0;font-size:12.5px;padding:2px 0}
.kp-input{flex:1;min-width:110px;border:0;outline:0;background:transparent;font-size:12.5px;color:#2b3a5c;padding:4px 0;font-family:inherit}
.kp-input::placeholder{color:#a0abc0}
.kp-caret{position:absolute;right:10px;top:50%;transform:translateY(-50%);color:#8fa3c9;font-size:12px;pointer-events:none;transition:transform .15s}
.kp-picker[data-open="1"] .kp-caret{transform:translateY(-50%) rotate(180deg)}
.kp-menu{margin-top:6px;border:1px solid #e2e9f7;border-radius:11px;background:#fff;box-shadow:0 10px 30px rgba(20,40,90,.10);overflow:hidden}
.kp-options{max-height:210px;overflow-y:auto;padding:5px}
.kp-option{display:flex;align-items:center;gap:8px;padding:7px 9px;border-radius:8px;cursor:pointer;font-size:12.5px;color:#3f4f6d}
.kp-option:hover{background:#f5f8ff}
.kp-option.on{background:#eef3ff;color:#244fc6;font-weight:650}
.kp-option input{width:15px;height:15px;accent-color:var(--blue);flex:0 0 auto}
.kp-option-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.kp-badge{font-style:normal;font-size:10px;font-weight:700;color:#8b97ad;background:#f2f4f9;border-radius:5px;padding:1px 5px;flex:0 0 auto}
.kp-option.on .kp-badge{background:#dbe5fb;color:#2f56b5}
.kp-none{padding:10px;font-size:12px;color:#8b97ad;text-align:center}
.kp-create{display:block;width:calc(100% - 10px);margin:0 5px 5px;border:1px dashed #b9cdf3;border-radius:8px;background:#f7faff;color:#2f56b5;font-size:12.5px;font-weight:650;padding:8px 10px;text-align:left;cursor:pointer;font-family:inherit}
.kp-create:hover{background:#eef3ff}
.kp-create b{font-weight:800}

/* 关联知识点弹窗 */
.kp-edit-card{max-width:620px}
.kp-edit-q{display:flex;gap:8px;align-items:baseline;background:#f7f9fe;border:1px solid #eef2fb;border-radius:10px;padding:9px 11px;margin:8px 0 14px;font-size:12.5px;color:#5d6b86}
.kp-edit-q b{color:#2b3a5c;white-space:nowrap}
.kp-edit-q span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

@media(max-width:720px){
  /* 手机端保留 知识点 / 班级掌握率 / 错题学生 三列，关联试题收起（点行看详情） */
  .kp-table-v2{table-layout:fixed;min-width:0}
  .kp-table-v2 th:nth-child(1){width:82px}
  .kp-table-v2 th:nth-child(2){width:136px}
  .kp-table-v2 th:nth-child(3),.kp-table-v2 .col-relate{display:none}
  .kp-table-v2 .col-mastery{width:136px;min-width:0}
  .kp-table-v2 .col-names{display:table-cell;width:auto;min-width:0}
  .kp-table-v2 .col-names .dash-name{padding:1px 5px;font-size:10.5px}
  .kp-table-v2 .mastery-sub{white-space:normal;font-size:10px;line-height:1.35}
  .kp-table-v2 .col-type .badge.kp{font-size:11px;padding:2px 6px}
  .kp-empty{padding:13px;gap:10px}
  .kp-empty .btn{margin-left:0;width:100%}
  .kp-edit-q span{white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .kp-options{max-height:180px}
}

@media(max-width:375px){
  .kp-table-v2 th:nth-child(1){width:82px}
  .kp-table-v2 th:nth-child(2){width:126px}
  .kp-table-v2 .col-mastery{width:126px}
  .kp-table-v2 th,.kp-table-v2 td{padding:7px 5px}
}